Question

1. choose the best answer. which scientist uses models to invent products like plastics and vaccines? chemical engineer biologist geologist chemist 9) choose the best answer. why are molecular models likely used before creating plastic bottles? to identify what polyethylene reacts with to determine the number of hydrogen atoms in polyethylene to understand how polyethylene behaves when shaped to describe the properties of polyethylene

Explanation:

For question 8, chemical engineers use models to design and invent products like plastics and vaccines by applying chemical - process knowledge. Biologists focus on living organisms, geologists on the Earth's physical structure, and chemists on chemical reactions in a more fundamental way. For question 9, molecular models help in understanding how a material like polyethylene behaves when shaped, which is crucial for creating plastic bottles. Identifying reactions, determining atom numbers, and describing properties are also important but understanding shaping behavior is most relevant for bottle - creation.

Answer:

1. chemical engineer
2. to understand how polyethylene behaves when shaped